SP1 is available for download at:
http://www.microsoft.com/downloads/details.aspx?FamilyID=2ceb14d4-404b-4d8f-8a21-ebfc71b2e82

View a list of new features at:
http://blogs.technet.com/fss/archive/2007/08/13/forefront-security-for-sharepoint-with-service-pack

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